Pillar Fixing Metal Fitting with Segmented Joint Base
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Solution Overview
Problem
Existing pillar fixing metal fittings, such as those used in the drift-pin construction method, face challenges in achieving high earthquake-resistant and wind-resistant strength, particularly in the 2×4 construction method, and require skilled labor for accurate assembly, which is difficult to secure in many situations.
Innovation Solution
A pillar fixing metal fitting comprising a joint base with bolt holes and a cover spacer, designed for easy assembly, which includes a joining plate that is drift-pin joined to the pillar, allowing for high misalignment accuracy and robust connection to horizontal members without needing skilled manual operation, optimized for both I.D.S and 2×4 construction methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional wooden framework construction method is used with through pillars, then freedom of designing is high and structure is simple, but earthquake-resistant strength decreases due to loss of pillar cross section at joined parts
Solution Approach 1:
The metal fitting is divided into multiple components: joint base, cover spacer, and joining plate. These segments work together to distribute loads and prevent pillar breakage while maintaining design flexibility.
Solution Approach 2:
The invention combines metal fittings with wooden pillars to create a composite joint system. The metal components compensate for the weakness of wood at joined parts, providing earthquake-resistant strength while preserving the wooden framework's design freedom.
2Strength
If drift-pin construction method is used to strengthen earthquake resistance, then pillar cross section is preserved and joined parts are fixed rigidly, but assembly requires skilled labor with high processing accuracy
Solution Approach 1:
The metal fitting design enables self-alignment and easy assembly without requiring skilled labor. The cover spacer and joint base automatically position themselves during assembly, eliminating the need for precise manual processing while maintaining rigid fixation for earthquake resistance.
Solution Approach 2:
The fitting components are pre-designed with specific geometries (groove shapes, L-shaped groove walls) that guide the assembly process and ensure proper positioning before final fastening, reducing the skill level required for correct installation.
3Stability of the object's composition
If multiple beams are inserted into through pillar from four directions, then structural connectivity is improved, but pillar cross section is largely lost leaving only central part, creating weak spot
Solution Approach 1:
The joint base is segmented into multiple insertion regions that can accommodate beams from different directions. Each segment provides support and distribution of loads, maintaining pillar strength while achieving comprehensive structural connectivity.
Solution Approach 2:
The metal fitting serves multiple functions simultaneously: it provides structural connectivity for beams from multiple directions, preserves the effective cross section of the pillar, and maintains earthquake-resistant strength through its rigid fixation design.
Data Source
AI summary
The fixing metal fitting including: a joint base in groove shape mainly composing a joint metal; a cover spacer in groove shape capable of supporting the pillar's axial load by covering the joint base, wherein joint base including: a plane section in rectangular shape coinciding with an end surface of the pillar; a pair of groove walls bent vertically in L shape; and a joining plate standing from the plane section and supported by welded part J contacting at least the pair of groove walls or groove bottom, wherein the cover spacer including: a plane section in rectangular shape for supporting pillar by abutting to the pillar's end surface; a pair of groove walls composed of side edges of plane section respectively bent vertically in L shape; and a slit drilled such that the joining plate will be fitted into slit when the cover spacer is covering the joint base.